"One of the things that's so important for pediatricians and other health care givers is to get out there and make it as loud a message as possible that vaccines save lives," she continued.

Casey said the office will be selling the T-shirts, with proceeds being donated to a charity that helps those in impoverished countries have access to vaccines.

The effort came as New York's Monroe County faces a measles outbreak.

According to NBC News, a growing number of adult teens are sharing their choice to get vaccinated after their parents initially chose not to get them vaccinations as children. The movement comes as health officials in multiple states, including Washington and Oregon, grapple with measles outbreaks.